CN109694992A - A kind of tensile strength is greater than the quenching partition steel and its production method of 1500MPa - Google Patents
A kind of tensile strength is greater than the quenching partition steel and its production method of 1500MPa Download PDFInfo
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- CN109694992A CN109694992A CN201710984765.7A CN201710984765A CN109694992A CN 109694992 A CN109694992 A CN 109694992A CN 201710984765 A CN201710984765 A CN 201710984765A CN 109694992 A CN109694992 A CN 109694992A
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
- C21D8/0205—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips of ferrous alloys
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
- C21D8/0221—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the working steps
- C21D8/0226—Hot rolling
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
- C21D8/0221—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the working steps
- C21D8/0236—Cold rolling
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
- C21D8/0247—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the heat treatment
- C21D8/0263—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the heat treatment following hot rolling
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
- C21D8/0247—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the heat treatment
- C21D8/0273—Final recrystallisation annealing
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Heat Treatment Of Sheet Steel (AREA)
Abstract
The present invention discloses a kind of quenching partition cold-rolled steel sheet and production method of the tensile strength greater than 1500MPa, C:0.25-0.32%, Si:1.2-1.8%, Mn:2.5-3.2%, P :≤0.02%, S :≤0.005%, surplus is Fe and inevitable impurity；Steel plate group is woven to ferrite, martensite and metastable austenite；Steel plate tensile strength is greater than 1500MPa, while having good plasticity, can be used for cold forming, provides ideal lightweighting materials for automobile industry.
Description
Technical field
The invention belongs to cold rolled automobile steel making fields, are related to a kind of quenching partition of the tensile strength greater than 1500MPa
Cold-rolled steel sheet and its production method.
Background technique
21 century, auto industry are persistently grown rapidly, and while bringing convenience to people's daily life, are also transported to traffic
It is defeated make, the energy and ecological environment bring huge burden, automotive light weight technology is one of the method for effectively controlling this problem, number
It, can energy saving 6%~10% according to the every decline 10% of vehicle weight is shown.Therefore, automotive light weight technology becomes inexorable trend.
Realize this target of automotive safety, lightweight, high performance, low emission and lower cost, with light-alloy, modeling
During material and the competition such as composite material, the technology development of steel and iron industry and innovate it is particularly significant, so advanced high-strength steel is answered
It transports and gives birth to, it can allow automobile to realize lightweight, and under the premise of guaranteeing vehicle safety performance, intensity is higher, and steel plate thickness is more
Thin, this reduces the weight of vehicle body, have saved the energy, reduce the pollution etc. to environment, currently, its Recent Progresses In The Development becomes
The emphasis that iron and steel enterprise and automobile industry are concerned about.Quenching partition steel, also referred to as QP (Quenching and Partitioning) steel,
Belong to the advanced high-strength steel of the third generation, microscopic structure is made of the retained austenite of martensite and 10%~20%, is had excellent
Mechanical property, particularly suitable for automobile structure, reinforcer be thinned, wide market.With pair of equal tensile strength
Phase steel is compared, it has higher elongation percentage；Compared with the transformation induced plasticity steel of equal tensile strength, it has lower carbon
Equivalent.
The basic principle of quenching partition steel is taught by American scholar Speer and was put forward for the first time in 2003, that is, is based on existing to carbon
Martensite in retained austenite line and staff control reallocate rule re-recognize, by quenching-with division technique realize C element from
Diffusion of the martensite to retained austenite, obtains the metastable austenite of certain volume score at room temperature, and metastable austenite is becoming
TRIP effect occurs during shape, to obtain good intensity and plasticity cooperation.However, since the technique needs after quenching
It reheats, the cooling and aging section heating Capability Requirement to annealing furnace are higher, therefore stop always to the research of this new steel grade for many years
Stay in theoretical research and laboratory stage.Since 2012, Baosteel and Anshan iron and steel plant successively complete the Industry trial-production of quenching partition steel,
Realize the conversion of theory into action, excellent product performance.Wherein, Baosteel is produced using the dedicated producing line of its high-strength steel, using tight
The heating of the quenching partition technique of lattice, i.e. austenite one phase area；The dedicated producing line of Anshan iron and steel plant high-strength steel is completed, therefore according to existence conditions,
It is successfully realized the industrialized production of the product in traditional producing line using the quenching partition technique of coexistence region heating for the first time.By
Currently, the only above-mentioned Liang Jia iron and steel enterprise in the whole world can be realized the volume shipment of quenching partition steel, and all carrying out higher intensity
The development of rank and hot dip zinc product.
106119493 A of Publication No. CN, entitled " manganese autobody sheet and preparation in the superhigh intensity with excellent plasticity
The Chinese patent of method ", although having obtained ideal tensile strength, Mn constituent content is excessively high in its ingredient, is 8%-
12%, it is very easy to cause serious component segregation, forms banded structure, and then influence the mechanical property of steel plate.
Summary of the invention
In order to overcome drawbacks described above, technical problem to be solved by the invention is to provide a kind of tensile strength to be greater than
The cold rolled automobile of 1500MPa superhigh intensity quenching partition steel plate and its production method, steel plate tensile strength are greater than 1500MPa,
There is good plasticity simultaneously, can be used for cold forming, provide ideal lightweighting materials for automobile industry.
Object of the present invention is to what is realized by following technical solution:
A kind of tensile strength is greater than the quenching partition cold-rolled steel sheet of 1500MPa, it is characterised in that chemical component by weight hundred
Point ratio are as follows: C:0.25-0.32%, Si:1.2-1.8%, Mn:2.5-3.2%, P :≤0.02%, S :≤0.005%, surplus is
Fe and inevitable impurity；
Steel plate group is woven to ferrite, martensite and metastable austenite；
C:C is most effective solution strengthening element in steel, and the intensity of steel plate significantly increases with the raising of C content, and C is also to mention
The important element of high austenite stability will utilize the certain volume score at room temperature of diffuseing to form of C especially in the present invention
Metastable austenite.Phosphorus content is too low, and martensite hardness decline, intensity is unable to satisfy requirement, while metastable austenite volume fraction
Decline or stability are insufficient.Carbon content is excessively high, and the plasticity decline of steel plate, formability and weldability reduce.Therefore the present invention claims C
Content is between 0.25-0.32%.
Si:Si can expand the area α+γ, widen the temperature range of overlooking area's processing.Si is non-carbide forming element,
The intensity and cold deformation hardening ratio of steel plate are improved by solution strengthening.In the present invention, dissolved in carbide using it
Extremely low characteristic is spent, is enriched with carbon into austenite, austenite decomposition is hindered, reduces the precipitation of cementite, guarantee metastable Ovshinsky
The rich carbon of body.Si content is insufficient, and the room temperature stability decline of metastable austenite, intensity, plasticity reduce simultaneously.Si too high levels,
The surface quality of hot rolling slab, the coating performance of cold-rolled steel sheet and welding performance can be reduced.Therefore the Si content in the present invention is
1.2-1.8%%.
Mn:Mn is one of effective solution strengthening element, can effectively improve the harden ability of product, can promote martensite
Formation, while Mn is also austenite stabilizer element, can reduce cementite Precipitation Temperature.Mn content is too low, the geneva bodily form
It is insufficient at amount, intensity decline, while the volume fraction and stability for the metastable austenite that do not can guarantee；Mn too high levels, then can
Serious component segregation is caused, banded structure is formed, influences the mechanical property of steel plate.Therefore the Mn content that the present invention selects exists
2.5-3.2 range.
P, S:P, S are relict element, and P easily causes steel plate center segregation, the serious impact flexibility for destroying steel, and there are secondary
Brittleness is processed, the hot-working and weldability of steel plate are unfavorable for；S easily forms non-metallic inclusion with Mn, makes the clod wash and expansion of steel plate
Pore performance decline, therefore both should try to control in reduced levels.That is P≤0.02%, S≤0.01%.
A kind of production method of quenching partition cold-rolled steel sheet of the tensile strength greater than 1500MPa, includes the following steps:
1) hot rolling: slab heating temperature is 1200~1250 DEG C, keeps the temperature 180min or more；Hot rolling start rolling temperature be greater than
1100 DEG C, finishing temperature is 850~1000 DEG C；Coiling temperature is 650~720 DEG C.
2) bell-type annealing: carrying out bell-type annealing after steel plate hot rolling, temperature is 600~700 DEG C, and the time is 300~
400min。
3) pickling and cold rolling: hot rolled plate carries out cold rolling after conventional pickling, and cold rolling reduction ratio controls between 50~60%.
4) continuous annealing: heating temperature be 750~820 DEG C, soaking time 140-170s, slow cooling speed be 5-10 DEG C/
S, 650~720 DEG C of slow cooling temperature, fast speed of cooling be 30-60 DEG C/s, rapid cooling temperature be 250~270 DEG C, partition temperature be 350~
400 DEG C, the partition time is 300~600s, air-cooled later to room temperature.
Production method in the present invention is different from proper QP heat treatment process: annealing heating temperature Ac1 with
Between Ac3, sheet steel sections austenitizing realizes enrichment of the carbon in austenite structure；Coexistence region slow cooling adjusts austenite, iron
Ferritic two-phase volume fraction, the further rich carbon of austenite；Then it is cooled to fastly with the cooling rate of 50-60 DEG C/s a certain between Ms and Mf
Temperature makes austenite fraction be changed into martensite；The partition temperature for being then warming up to Ms point or more is kept the temperature, and makes carbon from geneva
Body is spread to the austenite not changed；It is last air-cooled to room temperature, obtain the multiphase group of ferrite, martensite and metastable austenite
It knits.
The beneficial effects of the present invention are: (1) tensile strength provided by the present invention is greater than the quenching partition cold rolling of 1500MPa
Steel plate, chemical component is simple, does not add other elements in addition to C, Si, Mn, and smelting cost is cheap, and technology controlling and process is easy；(2) continuous
It is annealed into coexistence region heating, the cooling velocity that rapid cooling requires is 30-60 DEG C/s, it is of less demanding to the capacity of equipment of continuous annealing unit,
Production method is simple, and industrialization can be realized in conventional anneal producing line；(3) ferrite, martensite and metastable Ovshinsky are obtained at room temperature
The heterogeneous structure of body, steel plate tensile strength is greater than 1500MPa, while having good plasticity, can be used for cold forming, is automobile industry
Provide ideal lightweighting materials.
Specific embodiment
It is illustrated combined with specific embodiments below:
Embodiment chemical component is as shown in table 1:
1 chemical component of table (wt%)
Embodiment rolling technological parameter is as shown in table 2:
2 rolling technological parameter of table
Embodiment continuous annealing process parameter is as shown in table 3:
3 continuous annealing process parameter of table
Claims (3)
1. the quenching partition cold-rolled steel sheet that a kind of tensile strength is greater than 1500MPa, it is characterised in that chemical component percentage by weight
Than are as follows: C:0.25-0.32%, Si:1.2-1.8%, Mn:2.5-3.2%, P :≤0.02%, S :≤0.005%, surplus Fe
And inevitable impurity.
2. the quenching partition cold-rolled steel sheet that tensile strength according to claim 1 is greater than 1500MPa, it is characterised in that: institute
The steel plate group stated is woven to ferrite, martensite and metastable austenite.
3. a kind of production method of quenching partition cold-rolled steel sheet of the tensile strength according to claim 1 greater than 1500MPa, packet
Include following steps:
1) hot rolling: slab heating temperature is 1200~1250 DEG C, keeps the temperature 180min or more；Hot rolling start rolling temperature is greater than 1100
DEG C, finishing temperature is 850~1000 DEG C；Coiling temperature is 650~720 DEG C；
2) bell-type annealing: carrying out bell-type annealing after steel plate hot rolling, temperature is 600~700 DEG C, and the time is 300~400min；
3) pickling and cold rolling: hot rolled plate carries out cold rolling after conventional pickling, and cold rolling reduction ratio controls between 50~60%；
4) continuous annealing: heating temperature is 750~820 DEG C, soaking time 140-170s, and slow cooling speed is 5-10 DEG C/s, is delayed
650~720 DEG C of cold temperature, fast speed of cooling are 30-60 DEG C/s, and rapid cooling temperature is 250~270 DEG C, and partition temperature is 350~400
DEG C, the partition time is 300~600s, air-cooled later to room temperature.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710984765.7A CN109694992A (en) | 2017-10-20 | 2017-10-20 | A kind of tensile strength is greater than the quenching partition steel and its production method of 1500MPa |
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| CN201710984765.7A CN109694992A (en) | 2017-10-20 | 2017-10-20 | A kind of tensile strength is greater than the quenching partition steel and its production method of 1500MPa |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112481553A (en) * | 2020-11-11 | 2021-03-12 | 鞍钢股份有限公司 | 1000 MPa-grade automobile steel with good hardenability and ultra-fast cooling production method |
| CN111455282B (en) * | 2020-05-11 | 2021-03-16 | 武汉钢铁有限公司 | Quenching distribution steel with tensile strength more than or equal to 1500MPa produced by adopting short process and method |
| CN113897560A (en) * | 2021-10-18 | 2022-01-07 | 宁波祥路中天新材料科技股份有限公司 | Profiled bar steel with tensile strength of more than or equal to 1600MPa and production method thereof |
| CN114032452A (en) * | 2021-10-11 | 2022-02-11 | 鞍钢集团北京研究院有限公司 | High-strength-ductility cold-rolled TRIP steel plate and preparation method thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111455282B (en) * | 2020-05-11 | 2021-03-16 | 武汉钢铁有限公司 | Quenching distribution steel with tensile strength more than or equal to 1500MPa produced by adopting short process and method |
| CN112481553A (en) * | 2020-11-11 | 2021-03-12 | 鞍钢股份有限公司 | 1000 MPa-grade automobile steel with good hardenability and ultra-fast cooling production method |
| CN114032452A (en) * | 2021-10-11 | 2022-02-11 | 鞍钢集团北京研究院有限公司 | High-strength-ductility cold-rolled TRIP steel plate and preparation method thereof |
| CN113897560A (en) * | 2021-10-18 | 2022-01-07 | 宁波祥路中天新材料科技股份有限公司 | Profiled bar steel with tensile strength of more than or equal to 1600MPa and production method thereof |
| CN113897560B (en) * | 2021-10-18 | 2022-09-16 | 宁波祥路中天新材料科技股份有限公司 | Profiled bar steel with tensile strength of more than or equal to 1600MPa and production method thereof |
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Application publication date: 20190430 |